FI82827C - Foerfarande foer avlaegsnande av tungmetaller fraon surt, fosfatinnehaollande, vattenhaltigt medium. - Google Patents

Foerfarande foer avlaegsnande av tungmetaller fraon surt, fosfatinnehaollande, vattenhaltigt medium. Download PDF

Info

Publication number: FI82827C
Authority: FI; Finland
Prior art keywords: precipitate; calcium; phosphate; liquid medium; heavy metals
Prior art date: 1986-07-15

Application number

FI873107A

Other languages

English (en)

Finnish (fi)

Swedish (sv)

Other versions

FI873107A0 (fi

FI873107L (fi

FI82827B (fi

Inventor

Cornelis Antonius Ma Weterings

Johannes Anna Janssen

Original Assignee

Stamicarbon

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1986-07-15

Filing date

1987-07-14

Publication date

1991-04-25

1987-07-14 Application filed by Stamicarbon filed Critical Stamicarbon

1987-07-14 Publication of FI873107A0 publication Critical patent/FI873107A0/fi

1988-01-16 Publication of FI873107L publication Critical patent/FI873107L/fi

1991-01-15 Application granted granted Critical

1991-01-15 Publication of FI82827B publication Critical patent/FI82827B/fi

1991-04-25 Publication of FI82827C publication Critical patent/FI82827C/fi

Links

238000000034 method Methods 0.000 title claims abstract description 49
229910019142 PO4 Inorganic materials 0.000 title claims abstract description 43
NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 title claims abstract description 43
239000010452 phosphate Substances 0.000 title claims abstract description 43
229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 33
230000002378 acidificating effect Effects 0.000 title claims description 19
239000012736 aqueous medium Substances 0.000 title description 2
OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 37
-1 sulphate ions Chemical class 0.000 claims abstract description 29
235000011132 calcium sulphate Nutrition 0.000 claims abstract description 28
239000007788 liquid Substances 0.000 claims abstract description 23
239000002244 precipitate Substances 0.000 claims abstract description 23
BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 11
239000002253 acid Substances 0.000 claims abstract description 11
229910001424 calcium ion Inorganic materials 0.000 claims abstract description 11
229910021653 sulphate ion Inorganic materials 0.000 claims abstract description 9
239000001175 calcium sulphate Substances 0.000 claims abstract description 8
239000000654 additive Substances 0.000 claims abstract description 4
NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 50
229910000147 aluminium phosphate Inorganic materials 0.000 claims description 26
QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 24
ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 19
QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 10
238000000354 decomposition reaction Methods 0.000 claims description 8
238000001556 precipitation Methods 0.000 claims description 7
239000000047 product Substances 0.000 claims description 7
239000000203 mixture Substances 0.000 claims description 5
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
239000011575 calcium Substances 0.000 claims description 4
229910052791 calcium Inorganic materials 0.000 claims description 4
ZHJGWYRLJUCMRT-UHFFFAOYSA-N 5-[6-[(4-methylpiperazin-1-yl)methyl]benzimidazol-1-yl]-3-[1-[2-(trifluoromethyl)phenyl]ethoxy]thiophene-2-carboxamide Chemical compound C=1C=CC=C(C(F)(F)F)C=1C(C)OC(=C(S1)C(N)=O)C=C1N(C1=C2)C=NC1=CC=C2CN1CCN(C)CC1 ZHJGWYRLJUCMRT-UHFFFAOYSA-N 0.000 claims description 3
GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
239000011707 mineral Substances 0.000 claims description 3
229910017604 nitric acid Inorganic materials 0.000 claims description 3
238000002425 crystallisation Methods 0.000 claims description 2
230000008025 crystallization Effects 0.000 claims description 2
PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims 1
239000002609 medium Substances 0.000 description 16
229910052793 cadmium Inorganic materials 0.000 description 15
BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 15
150000008064 anhydrides Chemical class 0.000 description 8
239000007791 liquid phase Substances 0.000 description 7
150000004683 dihydrates Chemical class 0.000 description 6
239000012071 phase Substances 0.000 description 6
238000000926 separation method Methods 0.000 description 6
VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
239000013078 crystal Substances 0.000 description 4
239000006227 byproduct Substances 0.000 description 3
150000002500 ions Chemical class 0.000 description 3
150000003464 sulfur compounds Chemical class 0.000 description 3
CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
230000015572 biosynthetic process Effects 0.000 description 2
WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 2
229910000019 calcium carbonate Inorganic materials 0.000 description 2
ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
239000007795 chemical reaction product Substances 0.000 description 2
238000001816 cooling Methods 0.000 description 2
238000001914 filtration Methods 0.000 description 2
238000010348 incorporation Methods 0.000 description 2
238000010587 phase diagram Methods 0.000 description 2
238000002360 preparation method Methods 0.000 description 2
238000001953 recrystallisation Methods 0.000 description 2
239000007787 solid Substances 0.000 description 2
ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
229910021529 ammonia Inorganic materials 0.000 description 1
BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
229910052921 ammonium sulfate Inorganic materials 0.000 description 1
235000011130 ammonium sulphate Nutrition 0.000 description 1
229910052925 anhydrite Inorganic materials 0.000 description 1
238000006243 chemical reaction Methods 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
238000010276 construction Methods 0.000 description 1
238000004945 emulsification Methods 0.000 description 1
239000003337 fertilizer Substances 0.000 description 1
239000012467 final product Substances 0.000 description 1
239000012535 impurity Substances 0.000 description 1
238000000622 liquid--liquid extraction Methods 0.000 description 1
238000006386 neutralization reaction Methods 0.000 description 1
238000005192 partition Methods 0.000 description 1
FPYMUXNASDOMBA-UHFFFAOYSA-N phosphoric acid;hydrate Chemical compound O.OP(O)(O)=O.OP(O)(O)=O FPYMUXNASDOMBA-UHFFFAOYSA-N 0.000 description 1
150000003016 phosphoric acids Chemical class 0.000 description 1
239000011591 potassium Substances 0.000 description 1
229910052700 potassium Inorganic materials 0.000 description 1
239000011541 reaction mixture Substances 0.000 description 1
230000035484 reaction time Effects 0.000 description 1
239000007790 solid phase Substances 0.000 description 1
238000000638 solvent extraction Methods 0.000 description 1
239000000126 substance Substances 0.000 description 1
239000002699 waste material Substances 0.000 description 1
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1

Classifications

- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
- A62D3/33—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemical fixing the harmful substance, e.g. by chelation or complexation
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
- C01B25/223—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen only one form of calcium sulfate being formed
- C01B25/226—Hemihydrate process
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
- C01B25/228—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen one form of calcium sulfate being formed and then converted to another form
- C01B25/229—Hemihydrate-dihydrate process
- C01B25/2295—Hemihydrate-dihydrate process the conversion being performed in one or more vessels different from those used for reaction after separation of phosphoric acid
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/237—Selective elimination of impurities
- C01B25/238—Cationic impurities, e.g. arsenic compounds
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
- C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/20—Organic substances
- A62D2101/24—Organic substances containing heavy metals
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/40—Inorganic substances
- A62D2101/43—Inorganic substances containing heavy metals, in the bonded or free state

Landscapes

Chemical & Material Sciences (AREA)
Organic Chemistry (AREA)
Inorganic Chemistry (AREA)
Chemical Kinetics & Catalysis (AREA)
General Health & Medical Sciences (AREA)
Business, Economics & Management (AREA)
Geology (AREA)
Health & Medical Sciences (AREA)
Analytical Chemistry (AREA)
Toxicology (AREA)
General Chemical & Material Sciences (AREA)
Life Sciences & Earth Sciences (AREA)
Emergency Management (AREA)
Removal Of Specific Substances (AREA)
Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
Polysaccharides And Polysaccharide Derivatives (AREA)

FI873107A 1986-07-15 1987-07-14 Foerfarande foer avlaegsnande av tungmetaller fraon surt, fosfatinnehaollande, vattenhaltigt medium. FI82827C (fi)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
NL8601846		1986-07-15
NL8601846A NL8601846A (nl)	1986-07-15	1986-07-15	Werkwijze voor het verwijderen van zware metalen uit zure fosfaathoudende waterige media.

Publications (4)

Publication Number	Publication Date
FI873107A0 FI873107A0 (fi)	1987-07-14
FI873107L FI873107L (fi)	1988-01-16
FI82827B FI82827B (fi)	1991-01-15
FI82827C true FI82827C (fi)	1991-04-25

Family

ID=19848319

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FI873107A FI82827C (fi)	1986-07-15	1987-07-14	Foerfarande foer avlaegsnande av tungmetaller fraon surt, fosfatinnehaollande, vattenhaltigt medium.

Country Status (13)

Country	Link
US (1)	US4822582A (fr)
EP (1)	EP0253454B1 (fr)
AT (1)	ATE58358T1 (fr)
CA (1)	CA1327113C (fr)
DE (1)	DE3766173D1 (fr)
ES (1)	ES2019372B3 (fr)
FI (1)	FI82827C (fr)
GR (1)	GR3001466T3 (fr)
IL (1)	IL83181A (fr)
MA (1)	MA21033A1 (fr)
NL (1)	NL8601846A (fr)
TN (1)	TNSN87088A1 (fr)
ZA (1)	ZA875147B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2649391B1 (fr) *	1989-07-04	1991-10-31	Pierre Becker	Procede de traitement de l'acide phosphorique pour en eliminer certains metaux lourds
FR2652076B1 (fr) *	1989-09-20	1992-03-20	Rhone Poulenc Chimie	Procede de recuperation des valeurs de terres rares dans les gypses.
US5102556A (en) *	1990-03-30	1992-04-07	Union Oil Company Of California	Method for rendering ferric hydroxide sludges recyclable
TNSN92119A1 (fr) *	1992-02-07	1993-06-08	Ct D Etudes Et De Rech S Des Phosphates Mineraux Cerphos	Procede de fabrication d'acide phosphorique marchand a tres basse teneur en cadmium
ATE511553T1 (de) *	2007-03-06	2011-06-15	Ct D Etudes Et De Rech S Des Phosphates Mineraux	Verfahren zur verarbeitung von cadmiumhaltigen feststoffen
WO2014027348A1 (fr) *	2012-08-16	2014-02-20	Rotem Amfert Negev Ltd.	Procédé de fabrication d'acide phosphorique à teneur en cadmium réduite
FR3117476B1 (fr) *	2020-12-10	2023-04-21	Ocp Sa	Procede integre de decadmiation d’acide phosphorique

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US1601208A (en) *	1921-02-03	1926-09-28	Fed Phosphorus Co	Process of purifying phosphoric acid
US2081351A (en) *	1934-09-13	1937-05-25	Monsanto Chemicals	Process for the treatment of phosphoric acid
DE2218382C3 (de) *	1972-04-15	1975-08-21	Gebrueder Giulini Gmbh, 6700 Ludwigshafen	Verfahren zur Herstellung von reinem Calciumsulfat beim Phosphorsäurenaßaufschluß
SE418845B (sv) *	1979-05-10	1981-06-29	Boliden Ab	Forfarande for rening av vatprocessfosforsyra
JPS5933526B2 (ja) *	1980-07-28	1984-08-16	セントラル硝子株式会社	ウラン含有量の多い湿式リン酸の製造方法
US4388292A (en) *	1981-12-14	1983-06-14	United States Gypsum Company	Process for reducing radioactive contamination in phosphogypsum

1986
- 1986-07-15 NL NL8601846A patent/NL8601846A/nl not_active Application Discontinuation
1987
- 1987-07-02 US US07/069,512 patent/US4822582A/en not_active Expired - Fee Related
- 1987-07-13 MA MA21270A patent/MA21033A1/fr unknown
- 1987-07-13 CA CA000541862A patent/CA1327113C/fr not_active Expired - Fee Related
- 1987-07-14 ZA ZA875147A patent/ZA875147B/xx unknown
- 1987-07-14 IL IL83181A patent/IL83181A/xx not_active IP Right Cessation
- 1987-07-14 AT AT87201356T patent/ATE58358T1/de not_active IP Right Cessation
- 1987-07-14 ES ES87201356T patent/ES2019372B3/es not_active Expired - Lifetime
- 1987-07-14 EP EP87201356A patent/EP0253454B1/fr not_active Expired - Lifetime
- 1987-07-14 FI FI873107A patent/FI82827C/fi not_active IP Right Cessation
- 1987-07-14 DE DE8787201356T patent/DE3766173D1/de not_active Expired - Lifetime
- 1987-07-15 TN TNTNSN87088A patent/TNSN87088A1/fr unknown
1991
- 1991-02-11 GR GR91400176T patent/GR3001466T3/el unknown

Also Published As

Publication number	Publication date
EP0253454B1 (fr)	1990-11-14
FI873107A0 (fi)	1987-07-14
US4822582A (en)	1989-04-18
IL83181A (en)	1991-04-15
MA21033A1 (fr)	1988-04-01
ZA875147B (en)	1988-03-30
TNSN87088A1 (fr)	1990-01-01
EP0253454A1 (fr)	1988-01-20
CA1327113C (fr)	1994-02-22
IL83181A0 (en)	1987-12-31
ES2019372B3 (es)	1991-06-16
NL8601846A (nl)	1988-02-01
GR3001466T3 (en)	1992-10-08
DE3766173D1 (de)	1990-12-20
FI873107L (fi)	1988-01-16
ATE58358T1 (de)	1990-11-15
FI82827B (fi)	1991-01-15

Legal Events

Date	Code	Title	Description
1996-02-14	MM	Patent lapsed
2004-08-31	MM	Patent lapsed	Owner name: STAMICARBON B.V.

Publication	Publication Date	Title
US12139775B2 (en)	2024-11-12	Process for purifying and concentrating rare earths from phosphogypsum
CN116745240A (zh)	2023-09-12	从磷灰石矿物回收商业物质
PL155815B1 (pl)	1992-01-31	Sposób wydzielania lantanowców z fosfogipsu
FI82827C (fi)	1991-04-25	Foerfarande foer avlaegsnande av tungmetaller fraon surt, fosfatinnehaollande, vattenhaltigt medium.
JPS62171906A (ja)	1987-07-28	湿式法燐酸から不純物を除去する方法
US4236911A (en)	1980-12-02	Purification and conversion of phosphoric acid to ammonium phosphates
US4222990A (en)	1980-09-16	Production of fluoride-free phosphates
SU1706384A3 (ru)	1992-01-15	Способ очистки расплава или раствора нитрата кальци
US4086322A (en)	1978-04-25	Production of fluoride-free phosphates
US3803884A (en)	1974-04-16	Production of fertilizers
US4372923A (en)	1983-02-08	Purification of solutions of gallium values by liquid/liquid extraction
US3525585A (en)	1970-08-25	Process of preparing water-soluble phosphates
US4877594A (en)	1989-10-31	Purification of phosphoric acid
US4435372A (en)	1984-03-06	Production of purified strong wet-process phosphoric acid
US4324774A (en)	1982-04-13	Method for the manufacture of defluorinated phosphatic products
US3518071A (en)	1970-06-30	Production of nitrophosphate fertilizer and ammonium nitrate-calcium carbonate fertilizers
US4479923A (en)	1984-10-30	Production of phosphoric acid and additional products from phosphate ore
FI58903B (fi)	1981-01-30	Foerfarande foer rening av vattenhaltig raofosforsyra
Boukhsib et al.	2021	Process for Reducing the magnesium content in industrial phosphoric acid by its precipitation to magnesium fluorosilicate
NZ204113A (en)	1985-08-16	Recovery of phosphate values from phosphate ore
US4557909A (en)	1985-12-10	Method to improve acidulation quality of North Carolina phosphate rock
CA1042626A (fr)	1978-11-21	Production de phosphates exempts de fluor
SU1272974A3 (ru)	1986-11-23	Способ получени сложных удобрений
US3634029A (en)	1972-01-11	Production of feed grade dicalcium phosphate from mixtures of phosphoric and nitric acids
RU2075465C1 (ru)	1997-03-20	Способ переработки тетрагидрата нитрата кальция